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Author Topic: Sebo X4 Motor Intermittent Noises  (Read 590 times)

Offline JamieLincs

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Sebo X4 Motor Intermittent Noises
« on: April 27, 2024, 09:24:18 pm »
Last night our Sebo X4 started making a strange grinding noise. I took the brushroll out and the dustbag housing/handle secton off the base, did a quick clean and put it all back together again and it seemed fine.

This morning it worked for a while then it happened again, but now more constantly. So I took it apart fully to investigate properly.

The belts are in suprisingly excellent condition. At first it seemed like it might be the brushroll drive block bearing, but long story short, it's not, through a process of elimination and careful listening, it's definitely the main motor.

I've made a short video showing the motor brushes in action (at which point it's running cleanly) and then some clips of the noise coming and going. It's like a loud grinding noise coming from the main motor (even with nothing attached).


NB: The powering on and off in the video is me, it's not a fault.

I suspect a motor bearing is on the edge, but I just wondered what others think before I go off ordering parts. Is it likely just a bearing or something more sinister with the motor?

Basically, I'm wondering if new bearings and brushes would likely fix the problem given the commutator looks in similar condition to the one being refurbed in the Manchester Vacs video here: https://youtu.be/HP34-BRytsY

Thanks for any guidance on this.


Offline JamieLincs

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Sebo X4 Motor Intermittent Noises - Photos
« Reply #1 on: April 27, 2024, 09:45:44 pm »
I took a few very close up macro shots of the motor commutator and carbon brushes:

ila_rendered  ila_rendered  ila_rendered  ila_rendered

Offline Sam1979

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Re: Sebo X4 Motor Intermittent Noises
« Reply #2 on: April 28, 2024, 09:57:53 am »
I'd replace the brushes (sparking) and bearings and see, from other motors I've had apart over the years, but it's worth waiting for an X4/Domel motor expert to advise first. Not had one of these apart personally, although they are refreshingly easy to get to (having replaced a DC07 motor the other day).   

Offline JamieLincs

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Re: Sebo X4 Motor Intermittent Noises
« Reply #3 on: April 30, 2024, 12:37:36 pm »
Thank you @Sam1979

I’d love it if someone who knows these motors could chime in. It’s a somewhat weird noise as you could probably tell from the video, so I’m not 100% certain.

Just trying to figure out what I need to minimise postage and waste really. Fixing it either way (new motor, or bearings and brushes) is relatively easy. I just want to keep as much stuff out of landfill as possible if there’s no need.

Yes, the whole Sebo seems to have been built with servicing in mind; I’m actually impressed in that regard, which is very rare these days!

Offline Sam1979

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Re: Sebo X4 Motor Intermittent Noises
« Reply #4 on: April 30, 2024, 10:02:58 pm »
I'd be interested as well, like you say they're not hard to do but some prior knowledge of what usually still works and what might not would be really useful. I was pleasantly surprised the first time I opened a Sebo up - they do seem made to be repaired [and to go back together again - so much is effectively throw-away now].
 

Offline MVacs

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Re: Sebo X4 Motor Intermittent Noises
« Reply #5 on: May 01, 2024, 12:49:35 pm »
I just asked our engineer and showed him your video and photos.

He feels the top bearing is shot and the commutator *might* be OK. That would account for some of the noise there, and certainly the sparking. However, without replacing the top bearing and bench testing it, there is no other way to know if the commutator is too far gone or not. Only when the bearing is fixed and the armature runs true will you know if the sparking subsides.

Offline JamieLincs

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Re: Sebo X4 Motor Intermittent Noises
« Reply #6 on: May 21, 2024, 02:59:11 pm »
Thank you @MVacs - I've only just seen your comment today, but the other week I ordered replacement bearings and brushes, installed them, and I'm pleased to report, this seems to have fixed the problem.

Your engineer was bang on the money, the top bearing was completely shot.

Interestingly the two bearings installed new from the factory were different - the bottom one is stamped "England NMB 608Z" and the top one (near the brushes) "Indonesia NSK 608Z". The "England" one seems to be OK, but I replaced it anyway (it's very old). If I recall, the new ones from yourselves said "Singapore".

The old brushes were over half way gone, so worthwhile replacing those at this point too.

This is the first repair it's required in around 15 years of service, so hopefully good until at least 2040 now!

Offline MVacs

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Re: Sebo X4 Motor Intermittent Noises
« Reply #7 on: May 21, 2024, 03:22:24 pm »
It seems NMB have several factories, and as you can imagine, it is cheaper to manufacture in Singapore or Indonesia, so ones stamped England (which actually would be our preference), are thin on the ground. I haven't seen any for several years.

Great you are fixed up and all went well.  :thumbsup:

 

 

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